trunc(3) [freebsd man page]

TRUNC(3)						   BSD Library Functions Manual 						  TRUNC(3)

NAME

     trunc, truncf, truncl -- nearest integral value with magnitude less than or equal to |x|

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     trunc(double x);

     float
     truncf(float x);

     long double
     truncl(long double x);

DESCRIPTION

     The trunc(), truncf(), and truncl() functions return the nearest integral value with magnitude less than or equal to |x|.	They are equiva-
     lent to rint(), rintf(), and rintl(), respectively, in the FE_TOWARDZERO rounding mode.

SEE ALSO

     ceil(3), fesetround(3), floor(3), math(3), nextafter(3), rint(3), round(3)

STANDARDS

     The trunc(), truncf(), and truncl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').

HISTORY

     These routines first appeared in FreeBSD 5.3.

BSD
								  April 16, 2005							       BSD

TRUNC(3)						     Linux Programmer's Manual							  TRUNC(3)

NAME

       trunc, truncf, truncl - round to integer, toward zero

SYNOPSIS

       #include <math.h>

       double trunc(double x);
       float truncf(float x);
       long double truncl(long double x);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       trunc(), truncf(), truncl():
	   _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

DESCRIPTION

       These functions round x to the nearest integer not larger in absolute value.

RETURN VALUE

       These functions return the rounded integer value.

       If x is integral, infinite, or NaN, x itself is returned.

ERRORS

       No errors occur.

VERSIONS

       These functions first appeared in glibc in version 2.1.

ATTRIBUTES

   Multithreading (see pthreads(7))
       The trunc(), truncf(), and truncl() functions are thread-safe.

CONFORMING TO

       C99, POSIX.1-2001.

NOTES

       The integral value returned by these functions may be too large to store in an integer type (int, long, etc.).  To avoid an overflow, which
       will produce undefined results, an application should perform a range check on the returned value before assigning it to an integer type.

SEE ALSO

       ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

								    2013-06-21								  TRUNC(3)